How to use redis

Using the Redis Java library requires: 1. Add dependencies (Jedis 3.6.3); 2. Connect to the Redis server (specify host and port); 3. Perform basic operations (set/get values, check whether keys exist, delete keys); 4. Perform complex operations (hash tables, lists, collections, ordered collections); 5. Publish/subscribe messages (using JedisPubSub); 6. Close the connection (Jedis.close()).

How to use Redis Java

1. Add Redis dependencies

Add the following dependencies to your Maven project:

 <code class="xml"><dependency> <groupid>redis.clients</groupid> <artifactid>jedis</artifactid> <version>3.6.3</version> </dependency></code>

2. Connect to the Redis server

Create a connection using Jedis :

 <code class="java">Jedis jedis = new Jedis("localhost", 6379);</code>

in:

• "localhost" is the Redis server address.
• 6379 is the default port for Redis.

3. Basic Operation

• Set value:

   <code class="java">jedis.set("key", "value");</code>

• Get the value:

   <code class="java">String value = jedis.get("key");</code>

• Check if the key exists:

   <code class="java">boolean exists = jedis.exists("key");</code>

• Delete key:

   <code class="java">jedis.del("key");</code>

4. Complex operation

• Hash table:

   <code class="java">jedis.hset("hash", "field1", "value1"); jedis.hget("hash", "field1");</code>

• List:

   <code class="java">jedis.lpush("list", "value1", "value2"); jedis.lpop("list");</code>

• gather:

   <code class="java">jedis.sadd("set", "value1", "value2"); jedis.sismember("set", "value1");</code>

• Ordered collection:

   <code class="java">jedis.zadd("zset", 0.1, "value1"); jedis.zrange("zset", 0, 1);</code>

5. Publish/Subscribe

• Post a message:

   <code class="java">jedis.publish("channel", "message");</code>

• Subscribe to message:

   <code class="java">JedisPubSub pubSub = new JedisPubSub() { @Override public void onMessage(String channel, String message) { System.out.println("Received message: " message); } }; jedis.subscribe(pubSub, "channel");</code>

6. Close the connection

After using it, close the connection:

 <code class="java">jedis.close();</code>

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